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Evaluating Stress Intensity Factors for Surface Cracks in an Orthotropic Steel Deck Accounting for the Welding Residual Stresses
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.tafmec.2020.102827
Bin Qiang , Xin Wang

Abstract The welding residual stresses (WRSs) in an orthotropic steel deck were investigated via experimental measurement and finite-element simulation. Both the surface and through-thickness WRSs were obtained. The simulated residual stress fields were in reasonable agreement with the measured results. The weight function method (WFM) was then adopted to investigate the effects of WRSs on SIFs of semi-elliptical surface crack. The surface crack was subjected to a combination of far-field load and through-thickness WRSs, and different crack aspect ratios and relative depths were analyzed. The results reveal that the transverse residual stresses have prominent effects on SIFs: for the surface point, which is always located in the tensile stress region, its SIFs increase substantially with crack growing (a/t increasing); for the deepest point, WRSs lead to some SIFs increase with lower growth rate and some SIFs decrease continuously. This is due to that, as a/t increasing, the WRS level at crack tip location gradually decreases from the high tensile stress region, even into the compressive stress region.

中文翻译:

考虑焊接残余应力,评估正交异性钢甲板表面裂纹的应力强度因子

摘要 通过实验测量和有限元模拟研究了正交各向异性钢桥面板的焊接残余应力(WRSs)。获得了表面和厚度方向的 WRS。模拟的残余应力场与测量结果具有合理的一致性。然后采用权函数法(WFM)研究了WRSs对半椭圆表面裂纹SIFs的影响。表面裂纹受到远场载荷和全厚度 WRS 的组合作用,并分析了不同的裂纹纵横比和相对深度。结果表明,横向残余应力对SIFs有显着影响:对于始终位于拉应力区域的表面点,其SIFs随着裂纹的增长(a/t增加)而显着增加;对于最深的点,WRSs导致一些SIFs以较低的增长率增加,一些SIFs持续下降。这是因为,随着 a/t 的增加,裂纹尖端位置的 WRS 水平从高拉应力区域逐渐降低,甚至进入压应力区域。
更新日期:2020-12-01
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